Donat Mg is a sparkling water from Slovenia. Extreme magnesium-sulfate-bicarbonate type; among the most heavily mineralized bottled waters in the world, marketed for therapeutic and digestive use rather than everyday drinking.
| Ion | mg/L |
|---|---|
| Calcium (Ca²⁺) | 380 |
| Magnesium (Mg²⁺) | 1040 |
| Sodium (Na⁺) | 1565 |
| Chloride (Cl⁻) | 59 |
| Sulfate (SO₄²⁻) | 2400 |
| Bicarbonate (HCO₃⁻) | 7789 |
| At a glance | |
|---|---|
| Total of these six minerals | 13233 mg/L |
| Total hardness (as CaCO₃) | 5231.6 mg/L |
| Alkalinity (as CaCO₃) | 6387.4 mg/L |
| Sulfate-to-chloride ratio | 40.7:1 |
Mineral salts to dissolve in reverse-osmosis or distilled water, calculated by the BrewWaterSolver solver with the most common homebrew salts.
| Salt | 5 gal (18.9 L) | 20 L |
|---|---|---|
| Calcium chloride (CaCl₂) | 2.19 g | 2.31 g |
| Epsom salt (MgSO₄) | 137.63 g | 145.43 g |
| Chalk (CaCO₃) | 17.01 g | 17.97 g |
| Baking soda (NaHCO₃) | 122.70 g | 129.65 g |
Closest match with these salts; it can't reach Mg 718 mg/L vs 1040, Na 1777.3 mg/L vs 1565, SO4 2834 mg/L vs 2400, HCO3 5807.3 mg/L vs 7789 exactly.
Donat Mg is sparkling - the salts give you its minerals; carbonate the water yourself (e.g. with a soda maker) for the fizz.
Chalk (CaCO₃) doesn't dissolve well directly in mash or sparge water without dissolved CO₂ - slurry it in carbonated water (e.g. sparkling water) before adding it, rather than mixing it into still water or sprinkling it in dry, or the calculated amount may not fully dissolve. How to dissolve chalk with CO₂
Rogaska Slatina, Slovenia. Updated 2026-09 from a published clinical study's analysis of Donat Mg (PMC7400933).